Dense connection mechanism was proposed in DenseNet [1]}, which is widely used in the computer vision tasks in recent years. Different from the structure that only sends the hierarchical features to the final reconstruction layer, each layer in the dense block receives the features of all preceding layers (Fig. REF ). Short paths created between most of the layers can help alleviate the problem of vanishing/exploding gradients and strengthen the deep information flow through layers, thereby further improving the reconstruction accuracy.
